Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892a4d0dad41a19…

MALICIOUS

PDF

92.6 KB Created: 2021-08-25 05:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9aaa5841f8bff8ed561a2b744d0b74b SHA-1: b01a7c69941c5a4755190be397845f1dcfb836f5 SHA-256: d892a4d0dad41a19f0afb12205ace563097a2749efa5097b9e76030f669b03ef
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains heuristics indicating it is a link farm and a social engineering lure, specifically a 'ClickFix' attack and a 'Password-protected archive handoff'. The document body is heavily obfuscated, but the presence of external URIs and the ClamAV detection strongly suggest malicious intent. The primary attack pattern involves social engineering to trick the user into downloading a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d46a51d24---96215121007.pdf In PDF document text
    • http://mylodge-naoshima.com/nemomidaguberelomupub.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9043d69a---8140440061.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/78e92a36eff8347de119771af898c728/zidejiduba.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/35583484196.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/polapokabanazipo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/51910705459.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/19933846734.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/4810890334.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/77906853519.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82d25b305---11141684550.pdfIn PDF document text
    • https://eternalbliss.net/file/denika.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/kematulowowutewinijalo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/85239729397.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///16707622580.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/lubelujevojimovorotave.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb942acba33---55979566358.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/74342900971.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/wesulabetutidebipub.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c33c56ee1---lotakejinovepivivoviro.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/75192994896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=age+of+empires+definitive+edition+download+crackPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 11188 bytes
SHA-256: 0158ff1af4dcc7c993b778a8a95253458f273be8cbfb36ac69c2226c4b3aedb4
font_01_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 19060 bytes
SHA-256: a857cb8539d0c5689314ae5e721af26a55ea1b3c4c110f557cc60a26f0239c06

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